Pinking of a dog’s nose may be caused by weather changes, allergic dermatitis, aging, disease, genetic inheritance or trauma. You need to observe whether the dog has other diseases and you can give the dog an appropriate amount of seaweed powder. The pinkness of a dog's nose is due to the reduction of melanin. It is best to let the dog get more sun and supplement nutrition. This can make the dog recover quickly and the hair will become more shiny.